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7=a-
We move all terms to the left:
7-(a-)=0
We add all the numbers together, and all the variables
-(+a)+7=0
We get rid of parentheses
-a+7=0
We add all the numbers together, and all the variables
-1a+7=0
We move all terms containing a to the left, all other terms to the right
-a=-7
a=-7/-1
a=+7
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